package com.itheima.filter;

import jakarta.servlet.*;
import jakarta.servlet.annotation.WebFilter;
import lombok.extern.slf4j.Slf4j;

import java.io.IOException;

@WebFilter(urlPatterns = "/*")//拦截所有请求
@Slf4j
public class DemoFilter implements Filter {

    //初始化方法,web服务器启动的时候执行,只执行一次
    @Override
    public void init(FilterConfig filterConfig) throws ServletException {
        log.info("init 初始化方法 ...");
    }

    //拦截到请求之后,执行,会执行多次
    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        log.info("拦截到了请求...放行前...");
        //放行请求
        filterChain.doFilter(servletRequest,servletResponse);
        log.info("拦截到请求...放行后...");
    }


    //销毁方法,web服务器关闭的时候执行,只执行一次
    @Override
    public void destroy() {
        log.info("destroy 销毁方法 ...");
    }
}
